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WaterCalc version 1 Water Efficiency calculator
70.00 (no VAT)
plus 35.00 annual licence charge after first year (no VAT)
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This easy-to-use Windows based water efficiency calculation software is used to demonstrate compliance with Building Regulations Part G to show that the consumption of potable water in a new dwelling does not exceed 125 litres per person per day, and to indicate credits for the Code for Sustainable Homes.

WaterCalc is based on the Government's Water Efficiency Calculator for new dwellings, the national calculation methodology for assessing water efficiency in new dwellings in support of :

  • The code for Sustainable Homes, May 2009 and subsequent versions
  • The building Regulations 2000 (as amended)
  • The Building (approved Inspector etc.) Regulations 2000 (as amended)

    WaterCalc calculates the theoretical consumption of potable water in litres per person per day including savings which can be made by using greywater and rainwater.

    Advantages in using WaterCalc include:

  • easy to enter manufacturer's data.
  • does accurate calculations with intuitive and interactive interface.
  • allows for use of greywater and rainwater.
  • gets average rainfall by postcode.
  • saves all input data for re-use.
  • creates on-the fly pdf report
  • creates Notice of Water Efficiency as required by Building Control

    Performance targets Maximum (l/p/d)
    Regulation 17k compliance 125
    Code for Sustainable Homes (Level 1/2) 120
    Code for Sustainable Homes (Level 3/4) 105
    Code for Sustainable Homes (Level 5/6) 80

    This software contains public sector information licensed under the Open Government Licence v1.0

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